Calais is the closest entry point to the UK from Europe, with frequent ferry services to Dover, the Eurotunnel Shuttle service to Folkestone, and direct passenger trains to London St Pancras. About 10 million passengers and about £89 billion worth of UK trade pass through the port of Calais every year. A further 20 million passengers pass through the tunnel on Eurostar or the Shuttle. Most of the traffic is freight. Most of the passengers are British citizens on leisure trips. The growing number, and living conditions, of migrants in Calais, and the enhanced security measures brought in to counter them, have affected the residents of Calais, the reputation of the port of Calais, and the ease with which trade and traffic can pass between Britain and the Continent. The number of migrants at Calais has increased over 2014, from an estimated 1,300 in September, to about 2,500 by the end of October. The majority are from countries that have been affected by war or civil unrest. Most are men, and from Somalia, Sudan, Eritrea and Syria - in 2013 Syria overtook Afghanistan as the top country of origin of asylum-seekers in the world. Some of the migrants live in squats and small camps in the town of Calais, but most live in makeshift tents made out of plastic sheets and canvas, poorly constructed, located in empty industrial sites or woodland. The camps are not permanent and Calais is not the final destination, but a staging post for migrants wishing to enter the UK illegally. The UK cannot ignore the issues around Calais. While security in France is the responsibility of the French authorities, the UK operates juxtaposed border controls in Calais and Coquelles. These juxtaposed controls enable all border administration for entry to the UK to take place before passengers and vehicles leave France. Efficient management of queues and the ability to deliver on time are important, both to avoid disruption to carriers' timetables, and to avoid the excessive build-up of traffic on the surrounding road network. As well as ensuring the efficient and timely processing of travellers and freight, the border controls are needed to ensure the integrity of the UK border.